Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – With hole forming means
Patent
1994-07-18
1995-12-05
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
With hole forming means
411 43, F16B 1304
Patent
active
054723035
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention pertains to a blind rivet-type clamping fastener which includes a deformable sleeve part, a drift part which may be inserted into the sleeve part and cooperates with the same at least during the setting process, and a drilling part.
One example of a known rivet fastener (German Patent No. C 4,003,373) includes a rivet sleeve as well as a rivet drift which may be inserted into said rivet sleeve. The rivet sleeve and the rivet drift cooperate with each other via a thread. The enlarged head stud of the rivet drift is pressed against one end of the sleeve by turning the rivet drift relative to the rivet sleeve, so that the one end of the sleeve is expanded. Although such rivet fasteners are able to produce an excellent connection, the drilling part is still present at the rear side of the fastening point.
According to a different known variation (U.S. Pat. No. A 4,293,258), the drill tip, which is in this particular instance fastened onto the rivet sleeve, is also present once the setting process has been concluded.
The fact that this is practically always the case with self-drilling rivets is additionally substantiated by a previously disclosed self-drilling rivet (German Patent No. A 2,548,860). This particular rivet is provided with a plate-like drilling part which is constructed as one piece together with a widened head stud of the drift part, which, in other words, means that said drilling part is also present after the setting of the rivet fastener.
These protruding drilling parts represent a substantial hazard, in particular if the rear side of such connections is freely accessible. Although the utilization of self-drilling blind rivets substantially shortens the setting process and thus also reduces the mounting costs, the problem of injuries due to the protruding drilling parts remains.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a blind rivet-type clamping fastener of the initially mentioned type with which the advantages of a self-drilling design may be fully exploited during the mounting process, but which eliminates the hazard of injuries due to protruding drilling parts.
According to the invention, this and other objects are attained by the fact that the drilling part is held such that it may be moved or removed toward the free end of the clamping fastener by exerting an axial force during the setting of said clamping fastener.
The drilling part is sufficiently fastened on the clamping fastener during the drilling process, so that the hole required to accommodate the blind rivet-type clamping fastener may be produced. During the final setting of the clamping fastener, which means at the time at which the sleeve part is deformed correspondingly, a movement or removal of the drilling part is caused due to the exertion of forces in the axial direction. It is particularly advantageous that the drilling part does not have to be removed in a separate operation, but that the displacement or removal of the drilling part is facilitated directly by the setting process.
It is also particularly advantageous that the exertion of an axial force onto the drilling part may be triggered by the relative axial movement between the sleeve part and the drift part during the setting of the clamping fastener. This means that the axial movement between the sleeve part and the drift part during the deformation of the blind rivet-type clamping fastener is utilized to move or remove the drilling part in the axial direction. Only this particular measure facilitates that the drilling part may be removed without requiring an additional mounting or detaching operation.
The invention suggests that the drilling part is held on the sleeve part and/or the drift part in a nonpositive fashion in the axial direction and in a positive fashion in the rotational direction, whereby the drilling part is, on the side opposite the drill tip, provided with an approximately radially oriented stop surface which protrudes into the axial moving range of the drift part
REFERENCES:
patent: 4629380 (1986-12-01), Gunkel et al.
patent: 5183357 (1993-02-01), Palm
patent: 5213459 (1993-05-01), Palm
Gasser Daniel
Palm Erich
SFS Industrie Holding AG
Wilson Neill R.
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